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It doubles the EVs (and exp. I believe) gained in battle, which is awsum. The virus dissapears after 24 hours, but it gets replaced by a yellow dot on the Pokémon is status card. The yellow dot means that the Pokémon is still infected, but it won't be able to pass on the virus to other pokes, still, it gains the benefits from the virus. Also, if you keep a Pokémon on your PC with the virus, the counter that makes the virus a yellow dot will 'freeze' so you can infect other pokes later.

That's all I remember from Pokérus. Try to infect as many pokes as possible due to the benefits you gain from it.

I've heard about that. Does that just randomly happen like 1/1,000,000 or is there a certain way to get it?

Nope. It's based upon luck. No numerical values or anything since you got to encounter a wild Pokémon that has the virus (not necessarily catch it) in order to get infected.

Well, after doing some research, I forgot to say some things about the Pokérus.
It does not double exp. but you probably knew that already. :P
You must not engage in battle in order to spread it to other Pokémon. Just keep the infected one in your party and eventually your other Pokémon will get infected too.